Gear puller



Nov. 8, 1938. A. L. CORNWELL GEAR FULLER Filed 001;. 25, 1937 2Sheets-Sheet 1 ,ffizvenior;

AH THUR 1., CORA/WEZ 4 GEAR FULLER Filed 001:. 25, 1937 2 Sheets-Sheet2- ive/1:20

Patented Nov. 8 1938 UNITED STATES rnrlzrzTv OFFICE 2,136,004 GEARPULLER Arthur L. Cornwell, Wellsville, N. Y. Application October 25,1937, Serial No. 170,944

4 Claims.

This invention relates to tools or implements for removing gears fromshafts on which they are mounted, or like .dissembling operations. Aprincipal object of the invention is to provide a simply constructed,portable tool or implement that is adapted for convenient and efficientuse and capable of adjustment and arrangement for engaging gears andpinions of a wide range of sizes. A further object is to provide animproved device wherein the gear engaging arms are acted on by springmeans to cause yielding engagement of the arms with the gear, and alsoacted on by positive means to hold such arms securely engaged with thegear for the pulling operation.

The foregoing, and other objects and advantages of the invention, willbe better understood from the following detailed description taken inconnection with the accompanying drawings and distinctive features ofnovelty will be thereafter pointed out in the appended claims.

Referring to the drawings:

Figure 1 is a View partly in elevation and partly in central lengthwisesection of an implement embodying the invention.

Figure 2 is an endwise view thereof, looking from the left in Figure 1,and with certain parts removed.

Figure 3 is a view similar to Figure 1, but showing the gear engagingjaws open.

Figure 4 is a perspective View of one of the gear engaging jaws removed.

Figure 5'is an elevation showing the device as arranged for engagingsmaller sizes of gears; and

Figure 6 is a similar elevation showing the device as arranged forengaging larger gear sizes, the gear being shown in section.

in indicates the body or head of the device having a threaded boretherethrough, in which is fitted a screw stem l I. This stem l I mayhave a squared or hexagonal head Ha at its outer end, for application ofa wrench or the like to turn the same, and its inner end may be formedwith a central punch terminal lib, adapted to engage the end of a shaftS from which the gear G is to be removed. The head I is formed withopposite pairs of spaced apart ears or lugs l2, l3 extending radiallyoutward therefrom. These ears or lugs l2, I3 are formed on the outersides thereof, with open sockets I4, I adapted to receive fulcrum pinsl6 extending transverse- 1y from each side of the inner end portions ofgripping jaws l1. These jaws have their outer extremities formed withbeaks Ila adapted to engage the gear to be pulled, these beaks as shownbeing passed through openings O of the gear to engage the inner gearsurface. The jaws l1 are formed as bell crank levers having the shorterends I 111 thereof extending transversely of the head as the jaws aremounted in the sockets M or I 5. The sockets M are located in the innerportions of the lugs l2, l3 and the fulcrum pins 3 are mounted thereinas seen in Figures 1, 3, and 5 when the device is set for engagingsmaller sizes of gears, the beaks Ha then extending inward towards eachother. When the device is to be used for engaging larger sizes of gears,the jaws I l are removed and turned over as seen in Figure. 6, and thefulcrum pins l6 set in the outer sockets I5, the beaks Ila. thenextending outward away from each other to better engage such larger gearsizes. In such case the shorter arms l'lb, whether extending inward oroutward with respect to the head I0 as described, are engaged by afollower l8 sliolably fitted on the head ID. The outer portion of thehead I0 is externally threaded and has fitted thereon a nut l9constituting a clamping member having a knurled head l9a for turningsame whereby it may be adjusted against the follower l8, causing thefollower to press upon the arms Ho and swing the jaws I! either inwardor outward, according to the setting thereof, to cause the beaks toengage the gear for removing the same. It is desirable that the jaws Hbe spring biased to cause them to be held yieldingly in engagement withthe gear when they are applied thereto and before the nut I9 is screwedup so as to make such engagement rigid. For this purpose the nut is hasa quite substantial range of adjustment on the threaded portion of thehead l0 and a compression coil spring 20 is mounted to react between thehead |9a of the nut and the follower It so as to press the followeryieldingly against the arms Ilb and thus swing the beaks Ila yieldinglyinto the engagement with the gear while the nut I9 is adjusted outwardsome little distance away from the follower I8 as seen in Figure 5.

The described implement is thus adapted to be quickly and easily engagedwith gears or the like in a large range of sizes to apply the necessarypressure for removing the same from the shafts or equivalent elements onwhich they are mounted, and by reason of the action of the spring 20 thegear engaging jaws are spring biased to be pressed into engagement withthe gear surfaces as they are moved to operative position, the operationof the nut [9 then permitting the jaws to be firmly and securely engagedwith the gear as the stem H is operated to exert the necessary pressurefor removing the gear from a shaft.

I am aware that the invention in each of its several aspects may beembodied in other forms without departing from the spirit or essentialattributes thereof, and I therefore desire the present embodiment to beconsidered in all respects as illustrative and not restrictive,reference being had to the appended claims rather than to the foregoingdescription to indicate the scope of the invention. w

Having now described my invention, what I claim as new and desire tosecure by Letters Patent is:

1. An implement of the kind described, cornprising a head, a stemthreaded therethrough adapted to engage a shaft end or the like,coactive gripping levers with hooked ends pivotally mounted in said headadapted to engage a gear or the like, and adjustable means on said headfor acting resiliently on said levers to press them yieldinglyinto'engagement with such gear, said means equipped with a positiveadjusting element, said means arranged also to impart positive pressureupon said levers at will to cause them to engage the gear rigidly forthe pulling operation.

2. An implement of the kind described, comprising a head, means mountedtherein for reactive engagement with a shaft end, gripping leverspivotally mounted on said' head for engagement with a gear or the like,a member having relatively elongated threaded engagement with said headwith a spring interposed between the same and said levers, said memberhaving means associated therewith for pressing said levers positivelyinto engagement with the gear, or for exerting yielding pressurethereupon according to its position of adjustment.

3. An implement of the kind described, comprising a head having athreaded stem adjustable therethrough for engagement with a shaft end orthe like, gripping members oppositely mounted on the head, formed asbell crank levers with shorter arms thereof extending transversely ofthe head, a follower slidable on the head and engaging said shorterarms, and adjusting means on the head engaging said follower to swingsaid gripping members into engagement with the work, said adjustingmeans being formed as an elongated nut with an operating head at itsouter end, and with a compression spring located between said operatinghead and said follower adapted to transmit yielding pressure to saidgripping mem-- bers when said nut is in an outer adjusted position.

4. An implement for pulling gears and the like, comprising a head, athreaded stem adjustable therethrough, lugs extending radially atopposite sides of said head and formed with inner and outer opensockets, bell crank levers having transverse fulcrum pins detachablyfitted in either the inner or the outer'sockets at will, said levershaving longer gripping arms projecting from the end of said head, andshorter arms extending radially of said head, said levers beingreversible as to their mounting on said head, and adjustable means onsaid head for pressing upon said shorter lever arms yieldingly' orpositively according to the adjustment thereof.

ARTHUR 'L. CORNWELL.

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